Well, quake 3 really kills my card... most likely because im on a geforce 2 mx400, which im not happy about. Anyway... ut2k3 would be a good choice (cause of bomb-running and instagib ).
sof2 and rtcw would also be good choices.

huh? rather have ut2k3 on a gf2 mx 400 than quake 3? your card should be good to handle quake 3..heck sof2 and rtcw are all more demanding than quake 3. quake 3 is one of the most compatible 3d games out there.